In your admin panel, you will find an 'email members' link. When you click this, you're given a page which allows you to contruct an email and choose who to send it to.

You can use any member template variables in this message, and they will be automatically replaced with the proper value for the person who is reading the particular email. You can also use toplists.

Be sure that you've set the conditions for who will get this message using the selectors near the top of the page. If you only want to send to member who have submitted at least one link, for example, you would choose where links is greater than 0.

You may also send to all members simply by selecting that option.